Event Notification Report for June 25, 2016
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
06/24/2016 - 06/25/2016
EVENT NUMBERS
52044
52044
Power Reactor
Event Number: 52044
Facility: GRAND GULF
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: JOSEPH GRAHAM
HQ OPS Officer: VINCE KLCO
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: JOSEPH GRAHAM
HQ OPS Officer: VINCE KLCO
Notification Date: 06/25/2016
Notification Time: 18:30 [ET]
Event Date: 06/25/2016
Event Time: 14:07 [CDT]
Last Update Date: 06/25/2016
Notification Time: 18:30 [ET]
Event Date: 06/25/2016
Event Time: 14:07 [CDT]
Last Update Date: 06/25/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
JESSE ROLLINS (R4DO)
JESSE ROLLINS (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 99 | Power Operation | 0 | Hot Shutdown |
AUTOMATIC REACTOR SCRAM DUE TO TURBINE TRIP
"At 1407 [CDT], during power ascension to 100 percent, turbine control valves closed unexpectedly causing reactor protection trip signals that in turn caused a reactor scram. Reactor scram, turbine trip ONEPs [Off Normal Event Procedure], and EP2 [Emergency Procedure for Level Control] were entered. Reactor water level was stabilized at 36 inches narrow range on startup level and reactor pressure stabilized at 935 psig using bypass valves. No other safety system actuations occurred and all systems performed as designed."
All control rods inserted. Reactor level is maintained by feedwater. Normal electrical shutdown configuration is through offsite electrical power sources. The Safety Relief Valves lifted, then closed. The plant is stable at normal level and pressure and remains in Mode 3. The event is under licensee investigation.
The licensee notified the NRC Resident Inspector.
"At 1407 [CDT], during power ascension to 100 percent, turbine control valves closed unexpectedly causing reactor protection trip signals that in turn caused a reactor scram. Reactor scram, turbine trip ONEPs [Off Normal Event Procedure], and EP2 [Emergency Procedure for Level Control] were entered. Reactor water level was stabilized at 36 inches narrow range on startup level and reactor pressure stabilized at 935 psig using bypass valves. No other safety system actuations occurred and all systems performed as designed."
All control rods inserted. Reactor level is maintained by feedwater. Normal electrical shutdown configuration is through offsite electrical power sources. The Safety Relief Valves lifted, then closed. The plant is stable at normal level and pressure and remains in Mode 3. The event is under licensee investigation.
The licensee notified the NRC Resident Inspector.